Lil Dicky appears in the video in human form, albeit in a loincloth, as does Leonardo DiCaprio (in full Titanic mode). The actor’s eponymous foundation will help distribute proceeds from the track to environmental causes.

The song and video, which has been teased on social media since April 9, is scheduled to be released at midnight.

On Monday, Bieber tweeted: "Friday. Let's save the world." Charlie Puth tweeted Wednesday that the song "is about to be the biggest thing ever."